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hello! i just signed but not received/approved yet.

Sorry, I don't know mimetypes.py, but just adding this line, it's enough?

yes, it is added in the dictionary of _types_map_default, which is iterated upon initialization, such that each item will be added as mime type.

Closing this PR. audio/webm also has the same extension as video/webm. Might do it in another PR.